New Words：

youth [ju:θ] n. 青春；年轻；年轻人；小伙子

Sample Sentences：

His mistake was due to youth and inexperience.
There was a group of youths standing on the street corner.
The youth of today has greater opportunities than ever before.

due [dju:] adj. 由于；因为

New Words：

reasonable ['ri:znəbl] adj.合理的；通情达理的
explanation [.eksplə'neiʃən] n. 解释；说明

Sample Sentences：

My mother was always reasonable.
He gave me a reasonable explanation.
His explanation sounds reasonable to me.
How do you decide what you need and how much is reasonable to pay for it?

New Words：

cancel ['kænsl]
v.取消, 作废, 注销, 抵消, 删除
n.取消, 删除

Sample Sentences：

The match had to be cancelled because of bad weather.
There was a notice on the board saying the class had been cancelled.
If the worst comes to the worst, we'll have to cancel our holiday plans.

New Words：

unfortunate /ʌnˈfɔːrtʃənət/ adj. 不幸的；倒霉的；令人遗憾的；可惜的
unfortunately /ʌnˈfɔːrtʃənətli/ adv. 不幸地；遗憾地；可惜地；不巧

Sample Sentences：

I was unfortunate to lose my keys.
He was unfortunate to lose in the final round.

Unfortunately, we had to cancel the soccer game.
Unfortunately, I hurt my knee when I fell down on the ice.

cancel ['kænsl]
v.取消, 作废, 注销, 抵消, 删除
n.取消, 删除

New Words：

fortunate /ˈfɔːrtʃənət/ adj. 幸运的；吉利的；交好运的
fortunately /ˈfɔːrtʃənətli/ adv. 幸运地；交好运地；吉利地

Sample Sentences：

We must help others less fortunate than ourselves.
You are fortunate to have such a reasonable father.

I was late, but fortunately the meeting hadn't started.
Fortunately, the fire was discovered soon after it had started.

reasonable ['ri:znəbl] adj.合理的；通情达理的